// Copyright (C) 2011 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Runtime.InteropServices;

namespace Cairo {

	[StructLayout(LayoutKind.Sequential)]
	public struct RectangleInt {
		public int X;
		public int Y;
		public int Width;
		public int Height;
	}

	public enum RegionOverlap {
		In,
		Out,
		Part,
	}

	public class Region : IDisposable {

		IntPtr handle;
		public IntPtr Handle {
			get { return handle; }
		}

		[Obsolete]
		public Region(IntPtr handle) : this(handle, false) { }

		public Region(IntPtr handle, bool owned) {
			if (handle == IntPtr.Zero)
				throw new ArgumentException("handle should not be NULL", "handle");

			this.handle = handle;
			if (!owned)
				NativeMethods.cairo_region_reference(handle);
			if (CairoDebug.Enabled)
				CairoDebug.OnAllocated(handle);
		}

		public Region() : this(NativeMethods.cairo_region_create(), true) {
		}

		public Region(RectangleInt rect) {
			handle = NativeMethods.cairo_region_create_rectangle(ref rect);
		}

		public Region(RectangleInt[] rects) {
			handle = NativeMethods.cairo_region_create_rectangles(rects, rects.Length);
		}

		public Region Copy() {
			CheckDisposed();
			return new Region(NativeMethods.cairo_region_copy(Handle), true);
		}

		~Region() {
			Dispose(false);
		}

		public void Dispose() {
			Dispose(true);
			GC.SuppressFinalize(this);
		}

		protected virtual void Dispose(bool disposing) {
			if (!disposing || CairoDebug.Enabled)
				CairoDebug.OnDisposed<Region>(handle, disposing);

			if (handle == IntPtr.Zero)
				return;

			NativeMethods.cairo_region_destroy(Handle);
			handle = IntPtr.Zero;
		}

		void CheckDisposed() {
			if (handle == IntPtr.Zero)
				throw new ObjectDisposedException("Object has already been disposed");
		}

		public override bool Equals(object obj) {
			return (obj is Region) && NativeMethods.cairo_region_equal(Handle, (obj as Region).Handle);
		}

		public override int GetHashCode() {
			return Handle.GetHashCode();
		}

		public Status Status {
			get {
				CheckDisposed();
				return NativeMethods.cairo_region_status(Handle);
			}
		}

		public RectangleInt Extents {
			get {
				CheckDisposed();
				RectangleInt result;
				NativeMethods.cairo_region_get_extents(Handle, out result);
				return result;
			}
		}

		public int NumRectangles {
			get {
				CheckDisposed();
				return NativeMethods.cairo_region_num_rectangles(Handle);
			}
		}

		public RectangleInt GetRectangle(int nth) {
			CheckDisposed();
			RectangleInt val;
			NativeMethods.cairo_region_get_rectangle(Handle, nth, out val);
			return val;
		}

		public bool IsEmpty {
			get {
				CheckDisposed();
				return NativeMethods.cairo_region_is_empty(Handle);
			}
		}

		public RegionOverlap ContainsPoint(RectangleInt rectangle) {
			CheckDisposed();
			return NativeMethods.cairo_region_contains_rectangle(Handle, ref rectangle);
		}

		public bool ContainsPoint(int x, int y) {
			CheckDisposed();
			return NativeMethods.cairo_region_contains_point(Handle, x, y);
		}

		public void Translate(int dx, int dy) {
			CheckDisposed();
			NativeMethods.cairo_region_translate(Handle, dx, dy);
		}

		public Status Subtract(Region other) {
			CheckDisposed();
			return NativeMethods.cairo_region_subtract(Handle, other.Handle);
		}

		public Status SubtractRectangle(RectangleInt rectangle) {
			CheckDisposed();
			return NativeMethods.cairo_region_subtract_rectangle(Handle, ref rectangle);
		}

		public Status Intersect(Region other) {
			CheckDisposed();
			return NativeMethods.cairo_region_intersect(Handle, other.Handle);
		}

		public Status IntersectRectangle(RectangleInt rectangle) {
			CheckDisposed();
			return NativeMethods.cairo_region_intersect_rectangle(Handle, ref rectangle);
		}

		public Status Union(Region other) {
			CheckDisposed();
			return NativeMethods.cairo_region_union(Handle, other.Handle);
		}

		public Status UnionRectangle(RectangleInt rectangle) {
			CheckDisposed();
			return NativeMethods.cairo_region_union_rectangle(Handle, ref rectangle);
		}

		public Status Xor(Region other) {
			CheckDisposed();
			return NativeMethods.cairo_region_xor(Handle, other.Handle);
		}

		public Status XorRectangle(RectangleInt rectangle) {
			CheckDisposed();
			return NativeMethods.cairo_region_xor_rectangle(Handle, ref rectangle);
		}
	}
}